S-91251A340 10-32 x 3/8" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating, extending service life in harsh industrial environments.
• Exceptional mechanical strength from alloy steel, offering 170,000 psi tensile strength for high-stress applications.
• Precise thread engagement with Class 3A fit and UNRF fine threads, ensuring reliable, vibration-resistant connections.
• Easy installation and removal using a standard 5/32" hex key, reducing assembly time and tool wear.
• Full thread coverage along the 3/8" length, providing maximum grip and load distribution in tight spaces.
• Consistent hardness (Rockwell C37) for durability and resistance to stripping under repeated torque.
• Compliance with global standards including ASTM A574, RoHS 3, and REACH, ensuring safety and regulatory acceptance.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw is engineered to address critical challenges in precision machinery, automotive assemblies, and heavy-duty equipment. The 10-32 UNRF fine thread and Class 3A thread fit minimize backlash and enhance joint integrity in high-vibration settings, while the socket head design allows for compact installations where wrench clearance is limited. With a 170,000 psi tensile strength and corrosion-resistant coating, it reliably replaces standard fasteners in applications demanding superior mechanical performance and longevity, such as aerospace components, industrial robots, and precision instruments, reducing maintenance frequency and downtime.

Specification Summary & Compliance

This screw adheres to Class 3A thread tolerance for precise fit, with UNRF fine thread spacing and fully threaded design. It meets ASTM A574 specifications for high-strength alloy steel socket head cap screws and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material reliability in global supply chains.